Smoke filter plug or wad for cigarette paper tubes



15, 193a I B. AIVAZ 3 smoxm FILTER mm on. WAD FOR CIGARETTE PAPER TUBES Orig inalFiled Nov. 20, 1928 Patented Dec. 15, 1936' UNITED STATES;

PATENT OFFICE SMOKE FILTER PLUG OR WAD FOB CIGARETTE PAPER TUBES Boris Aivaz, Budapest, Hungary Original application November 20, 1928, Serial 320,733. Divided and this application April 21, 1933, Serial No. 667,287.

In Great Britain November 23, 1927 1 Claim. (Cl. 131-52) crepe paper sheets, between which absorptive filling material e. g. cellulose or absorptive paper is inserted, alternating with the crepe paper sheets and wound into a loose spiral. These compound paper sheets are then cut into strips of the necessary length.

This prior art smoke filter wad possesses the disadvantage that the center of the loose spiral contains a free channel having a diameter ,increasing with increase in the thickness of the ribbon from which the spiral is wound. This central channel will oiler the least resistance of any partof the section of the w'ad, against the smoke, so that a great part of the smoke will flow through this channel instead of through the smaller air gaps between the windings. This will reduce the absorbing eflect of the plug.

According to my invention the multiplecrepe paper strip forming the wad is doubledat the central part of the wad, whereby the doubled part constitutes a nucleus filling out the central channel of the wad, and avoids the aforementioned drawback. I I

The accompanying drawing, forming part of my application, illustrates the formation of a wad, according to my invention.

Therein, Fig. 1 is a. developed end view showing the multiple paper sheet construction.

Fig. 2 is a plan view thereof. '-Fig.' 3 is a perspective showing one stage of r the construction work.

Fig. 4 is a transverse end view of the completed assembly, arranged in a cigarette tube. In' Fig. l are shown three crepe paper sheets i a alternating with cellulose or-absorptive paper sheets I. The paper sheet is cut into strips 1) (Fig. 2) the length of which is equal to the length of the wad to be prepared.

As shown in Fig. 3, the strip b is, wound into a loose spiral the central part having first been folded so as to form a nucleus d. The end of the strip forms the center'oithe wad. Finally, the wound spiral is inserted in a cigarette tube 0, as shown in Fig. 4.

In the cigarette paper tube a wadis inserted composed of a strip of alternating crepe paper sheets a alternating with cellulose or absorptive papers f, inserted between the crepe paper sheets. The compound strip is folded at the central part of the wad so that a nucleus dis formed, which fills out the central channel of the wad. Thus the resistance againstthe flow oi smoke is-increased.

What 1 claim is:

A smoke filter wad for cigarette paper tubes, comprising a; strip of corrugated or crepe paper sheets wound into a loose spiral,. and absorptive filling material between and alternating with the corrugated or; crepe paper sheets, the inner end oi'the multiple strip being folded so as to fill out the central channel of the wad. 

